Lamp support arm



FIG. 1 is a side elevation view of the lamp support arm in accordancewith my design, illustrating a possible environment for the support arm;

FIG. 2 is a top plan view of the lamp support arm in accordance with mydesign;

FIG. 3 is a side elevation view of the lamp support arm in accordancewith my design;

FIG. 4 is a front elevation view of the lamp support arm in accordancewith my design; and,

FIG. 5 is a bottom plan view of the lamp support arm in accordance withmy design.

The right and left elevation views are symmetrical. The back isunornamented and not part of the claimed design. The broken linesshowing environmental structure are for illustrative purposes only andform no part of the claimed design.

The ornamental design for the lamp support arm, as shown and described.